softball player

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A softball player does a head-first dive and is sliding to the right across the infield dirt. Ignore air resistance.
A sledder has reached the bottom of a hill and is coasting to the right while slowing down along the loosely-packed snow. Ignore air resistance.
A hockey puck glides to the right across the ice at a constant speed. Ignore air resistance.
A rightward force is applied to a crate to push it across the floor at a constant speed. Ignore air resistance.